Process of dyeing khaki.



tlNiTnn STATES PATENT QFFICE.

GEORGE COMBER, OF KNUTSFORD, AND JOHN CHRISTMAS CIIORLEY, OF WARRINGTON, ENGLAND.

PROCESS CF DYEING KHAKI.

SPECIFICATION forming part of Letters Patent No. 65 5,854, dated August 14, 1900.

' Application filed June 1, 1900. Serial No. 18,772. (No specimens.)

To all whom it may concern.-

Be it known that we, GEORGE COMBER, a resident of Rowley Brow, Knutsford, in the county of Chester, and JOHN CHRISTMAS CHORLEY, a resident of Lodge Lane, Bewsey, WVarrington, in the county of Lancaster, England, subjects of the Queen of Great Britain, have invented a certain new and useful Improvement in Coloring Fabrics Composed of Vegetable or Animal Textile Fibers, of which the following is a specification.

Our invention relates to improvements in coloring fabrics composed of vegetable or animal textile fibers,'and ourimprovements consist, essentially, in dispensing with the ordinary dyeing processes and instead applying viscose mixed or combined with various coal,- gas, wood, or other tars with or without the addition of certain coloring materials to the fabrics, preferably by means of mangling or squeezing rollers.

The preparation of viscose, which is cellulose sulpho-carbonate dissolved in water, is described in the specification to United States Patent No. 520,770, dated June 5, 1894. The tar is mixed with the viscose in varying quantity, in some cases as much as a weight equal to the cellulose dissolved.

The process for cotton consistsin, first, the impregnation of the fabric, second, the drying up of the same; third, a treatment of steaming for one to two hours at about fivepounds pressure of steam or boiling in c0ncentrated brine for ten to fifteen minutes or a combination of these two processes; fourth, Washing with if necessary a bleaching or oxidizing treatment, and, finally, drying and finishing.

The process for W001 consists in, first, the impregnation of the fabric, followed immediately by, second, saturation in a solution of ammonium chlorid, whereby the caustic soda in the viscose is replaced by free ammonia; third, boiling in concentrated brine, and, fourth, washing and finishing.

For certain shades, such as khaki, ferrous or ferric hydrate may be added to the tar and viscose mixture with or without the addition of a little yellow dye.

A suitable mixture may be given for khaki coloring as follows: To one hundred pounds of viscose, containing ten pounds of dissolved cellulose, is added four pounds of gas-tar,and the whole is then thoroughly mixed. To this is added the ferrous or ferric hydrate in the wet precipitated form as obtained from ten pounds of ferrous sulfate (copperas) and also eight to ten ounces of primulin dye or other suitable dye previously dissolved in water. The whole is thoroughly mixed and made up to a total weight of two hundred pounds with water, if necessary adding a little caustic soda for the purpose of thinning the solution.

What we claim as out invention, and desire to secure by Letters Patent of the United States, is

The herein-described process for coloring textile fabrics which consists essentially in impregnating the fabrics with a mixture of tar and viscose, and fixing the same by steaming or boiling in concentrated brine and. washing and finishing in the usual way.

In witness whereof we have hereunto set our hands in presence of two witnesses.

GEORGE COMBER. JOHN CHRISTMAS CHORLEY.

Witnesses:

S. W. GILLETT, HERBERT ROWLAND ABBEY. 

